* {
  margin: 0;
  padding: 0;
}
body {
  background: #eee;
}
main {
  padding: 30px;
}
.box {
  width: 100%;
  height: 50px;
  padding: 0 30px;
  background: #333;
  margin: auto;
  display: flex;
  justify-content: center;
  align-items: center;
  position: sticky;
  top: 0;
}
.input {
  width: 50%;
  height: 25px;
  border-radius: 5px;
  outline: none;
  border: 1px solid #999;
}
button {
  width: 60px;
  height: 25px;
  margin-left: 10px;
  background: gold;
  border: none;
  outline: none;
  border-radius: 5px;
}
h2 {
  margin: 10px;
  position: sticky;
  top: 55px;
  background: #eee;
}
h3 {
  color: #fff;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  left: 30px;
}
.list,
.listed {
  min-height: 200px;
}
input[type="checkbox"] {
  width: 18px;
  height: 18px;
  vertical-align: middle;
}
li span {
  vertical-align: middle;
  margin-left: 10px;
}
li {
  list-style: none;
  border-bottom: 1px solid #ddd;
  height: 30px;
  line-height: 30px;
}
